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jsspace 发表于 2014-7-2 10:56 ; k$ v# {( k" f! B, M l
次级不能接地,这个在61347-2-13上已经明确说明了
0 y& n" E' T" c. ^; M/ o% G依据IEC61347-2-13 Clause 8.2, 满足条件的SELV都可以被人接触到,为什么不可以接地?' y3 M# F/ L) U% Z2 m
3 ^1 I: ^$ ~7 x7 I7 k3 C' j8.2 Output circuits of SELV- or SELV equivalent control gear may have exposed terminals if4 \3 w8 u# k5 Y" J- W% `
– the rated output voltage for constant voltage control gear or maximum output voltage for
" A( R. T: o8 l6 ^# E* t3 A& N7 `constant current control gear under load does not exceed 25 V r.m.s.;& Y8 u' j; _! B a- t4 X
– the no-load output voltage does not exceed 33 V r.m.s. and the peak does not exceed* O3 r9 w# e& G: ?+ @( e6 H
33 2 V.
& h% o# d( K0 ] o4 K/ L) B3 i- q8 J' ?Compliance is checked by measuring the output voltage when steady conditions are
" H# I1 Q2 L9 f3 Hestablished, the controlgear being connected to rated supply voltage and rated frequency. For
; g8 J5 L0 Z* c7 X: E8 Tthe test under load, the controlgear is loaded with a resistance which would give rated output0 t6 T, K1 J% ]0 e8 s
at rated output voltage.5 C, }" h3 F3 D# V; J
For controlgear with more than one rated supply voltage, the requirement is applicable for
7 h% [* f4 T7 h; Jeach of the rated supply voltages.4 b% k( G. Z* k. L+ ?6 r
Controlgear with a rated output voltage above 25 V shall have insulated terminals. |
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